Although intended for college students, the teacher is Savile Row tailor Joshua Dobrik. I've only watched the first one so far, but already he's answered questions I didn't even know I had! (sometimes we take convention for granted and forget to ask why):
https://www.youtube.com/playlist?list=PLCBQcUQNdD9PCBa3YHqkH66VhHu5gVA2w